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black 22nd January 2013 12:41 PM

bridge amplifier
1 Attachment(s)
is correct only bridge linking one rezistor ? without phase shifter

sregor 22nd January 2013 12:48 PM

Yes - second amp is a unity gain inverting amp. (+ input grounded, - input connected by same size resistor to output and other channel. Very common circuit used in most stereo bridgeable amplifiers, as only need one resistor and some switches to convert to bridge circuit.

black 22nd January 2013 02:09 PM

I hope not to burn anything in amplifier

TANDBERGEREN 22nd January 2013 05:33 PM

No problem, straight forward this sollution.
Look at the differential stage as a two input stage.
Inverted and non inverted. Probably easier to see how it all works then.

black 25th January 2013 10:12 AM

Does anyone have a step-up scheme for a class H amplifier integrated circuit without transistor only regards

DUG 25th January 2013 11:55 AM


Originally Posted by black (
is correct only bridge linking one rezistor ? without phase shifter

Put a capacitor in series with R17 or any DC offset will also be amplified.

That is what I would do.


black 25th January 2013 12:37 PM

the capacitor value and how to put the draw please put sal

DUG 25th January 2013 11:12 PM

1 Attachment(s)
Instead of just 22K add caps as shown.

Keep the 22K resistor lead very short at the feedback point end.

Put the caps at the "speaker" end.

Caps should be 35V minimum

This is what I would do.


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